[PATCH net v2 6/8] net: vti: implement header_ops->parse_protocol for AF_PACKET

[Jason A. Donenfeld]

Vti uses skb->protocol to determine packet type, and bails out if it's
not set. For AF_PACKET injection, we need to support its call chain of:

    packet_sendmsg -> packet_snd -> packet_parse_headers ->
      dev_parse_header_protocol -> parse_protocol

Without a valid parse_protocol, this returns zero, and vti rejects the
skb. So, this wires up the ip_tunnel handler for layer 3 packets for
that case.

Signed-off-by: Jason A. Donenfeld <ja...@zx2c4.com>
---
 net/ipv4/ip_vti.c  | 1 +
 net/ipv6/ip6_vti.c | 1 +
 2 files changed, 2 insertions(+)

diff --git a/net/ipv4/ip_vti.c b/net/ipv4/ip_vti.c
index 1d9c8cff5ac3..460ca1099e8a 100644
--- a/net/ipv4/ip_vti.c
+++ b/net/ipv4/ip_vti.c
@@ -441,6 +441,7 @@ static const struct net_device_ops vti_netdev_ops = {
 static void vti_tunnel_setup(struct net_device *dev)
 {
        dev->netdev_ops         = &vti_netdev_ops;
+       dev->header_ops         = &ip_tunnel_header_ops;
        dev->type               = ARPHRD_TUNNEL;
        ip_tunnel_setup(dev, vti_net_id);
 }
diff --git a/net/ipv6/ip6_vti.c b/net/ipv6/ip6_vti.c
index 1147f647b9a0..0d964160a9dd 100644
--- a/net/ipv6/ip6_vti.c
+++ b/net/ipv6/ip6_vti.c
@@ -905,6 +905,7 @@ static const struct net_device_ops vti6_netdev_ops = {
 static void vti6_dev_setup(struct net_device *dev)
 {
        dev->netdev_ops = &vti6_netdev_ops;
+       dev->header_ops = &ip_tunnel_header_ops;
        dev->needs_free_netdev = true;
        dev->priv_destructor = vti6_dev_free;
 
-- 
2.27.0